Branching structure for an (L-1) random walk in random environment and its applications

Details Branching structure for an (L-1) random walk in random environment and its applications Branching structure for an (L-1) random walk in random environment and its applications

2010-03-19

arxiv.org/abs/1003.3731v1

Mathematics

Probability

31 pages

Scientific paper

By decomposing the random walk path, we construct a multitype branching process with immigration in random environment for corresponding random walk with bounded jumps in random environment. Then we give two applications of the branching structure. Firstly, we specify the explicit invariant density by a method different with the one used in Br\'emont [3] and reprove the law of large numbers of the random walk by a method known as the environment viewed from particles". Secondly, the branching structure enables us to prove a stable limit law, generalizing the result of Kesten-Kozlov-Spitzer [11] for the nearest random walk in random environment. As a byproduct, we also prove that the total population of a multitype branching process in random environment with immigration before the first regeneration belongs to the domain of attraction of some \kappa -stable law.

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